Navigasi

Creates a quadtree-based spatial index for a Shape data set. The
default tree depth is calculated so that each tree node (quadtree
cell) contains 8 shapes. Do not use the default with point files, a
value between 6 and 10 seems to work ok. Your millage may vary and
you'll need to do some experimenting.

This utility is a must for any MapServer application that uses Shape
data sets. Shptree creates a spatial index of your Shape data set,
using a quadtree method. This means that MapServer will use this
index to quickly find the appropriate shapes to draw. It creates a
file of the same name as your Shape data set, with a .qix file
extension. The quadtree method breaks the file into 4 quadrants,
recursively until only a few shapes are contained in each quadrant.
This minimum number can be set with the <depth> parameter of the
command.

A file named 'us_states.qix' is created in the same location. (note
that you can use the shptreevis utility, described next, to view the
actual quadtree quadrants that are used by MapServer in this qix
file)

Shape data sets are native to MapServer, and therefore do not require
the .shp extension in the DATA path of the LAYER. In fact, in order
for MapServer to use the .qix extension you MUST NOT specify the
extension, for example:

LAYER...DATA"us_states"#MapServer will search for us_states.qix and will use it...ENDLAYER...DATA"us_states.shp"#MapServer will search for us_states.shp.qix and won't find it...END

Catatan

As of MapServer 5.2 the qix will be used even when the .shp extension is specified